/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.defence.costomapp.qrcode.zxing.utils;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;


import com.defence.costomapp.qrcode.zxing.ScanManager;
import com.defence.costomapp.qrcode.zxing.camera.CameraManager;
import com.defence.costomapp.qrcode.zxing.decode.DecodeThread;
import com.defence.costomapp.R;
import com.google.zxing.Result;

/**
 * This class handles shouquan_ic_all the messaging which comprises the state machine for
 * capture.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
public class CaptureActivityHandler extends Handler {

    final ScanManager scanManager;
    final DecodeThread decodeThread;
    final CameraManager cameraManager;
    State state;

    enum State {
        PREVIEW, SUCCESS, DONE
    }

    public CaptureActivityHandler(ScanManager scanManager, CameraManager cameraManager, int decodeMode) {
        this.scanManager = scanManager;
        decodeThread = new DecodeThread(scanManager, decodeMode);
        decodeThread.start();
        state = State.SUCCESS;

        // Start ourselves capturing previews and decoding.
        this.cameraManager = cameraManager;
        cameraManager.startPreview();
        restartPreviewAndDecode();
    }

    @Override
    public void handleMessage(Message message) {
        switch (message.what) {
            case R.id.restart_preview:
                restartPreviewAndDecode();
                break;
            case R.id.decode_succeeded:
                state = State.SUCCESS;
                Bundle bundle = message.getData();

                scanManager.handleDecode((Result) message.obj, bundle);
                break;
            case R.id.decode_failed:
                // We're decoding as fast as possible, so when one decode fails,
                // start another.
                state = State.PREVIEW;
                cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
                break;
            case R.id.decode_error:
                scanManager.handleDecodeError((Exception) message.obj);
                break;
            case R.id.return_scan_result:
//			activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
//			activity.finish();
                break;
        }
    }

    public void quitSynchronously() {
        state = State.DONE;
        cameraManager.stopPreview();
        Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
        quit.sendToTarget();
        try {
            // Wait at most half a shouquan_icon_second; should be enough time, and onPause()
            // will timeout quickly
            decodeThread.join(500L);
        } catch (InterruptedException e) {
            // continue
        }

        // Be absolutely sure we don't send any queued up messages
        removeMessages(R.id.decode_succeeded);
        removeMessages(R.id.decode_failed);
    }

    void restartPreviewAndDecode() {
        if (state == State.SUCCESS) {
            state = State.PREVIEW;
            cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
        }
    }

    /**
     * @return 返回当前扫描状态，是否可扫描,State.PREVIEW 是可扫描状态
     */
    public boolean isScanning() {
        if (state == State.PREVIEW) {
            return true;
        }
        return false;
    }
}
